IEC 60255-121:2014 

Measuring relays and protection equipment - Part 121: Functional requirements for distance protection

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Abstract

IEC 60255-121:2014 specifies minimum requirements for functional and performance evaluation of distance protection function typically used in, but not limited to, line applications for effectively earthed, three-phase power systems. This standard also defines how to document and publish performance tests. This standard covers distance protection function whose operating characteristic can be defined on an impedance plane and includes specification of the protection function, measurement characteristics, phase selection, directionality, starting and time delay characteristics. The test methodologies for verifying performance characteristics and accuracy are included in this standard. The standard defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. It also includes the instrument transformer requirements for the protection function. The general requirements for measuring relays and protection equipment are defined in IEC 60255-1.

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Additional information

Publication typeInternational Standard
Publication date2014-03-07
Edition1.0
Available language(s)English/French
TC/SCTC 95 - Measuring relays and protection equipmentrss
ICS29.120.70 - Relays
Stability date  2020
Pages302
File size4450 KB

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